SIGNA™ Hero 3.0T Service Methods
5852800-8EN Revision 1.0
Object ID: 00000018WIA306CB230GYZ
Topic ID: id_15667236 Version: 1.9
Date: Jul 13, 2021 4:27:36 PM

FPU Sensor Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	60 minutes	15 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard Tool	1	-	-	-
Flashlight	1	-	-	-
20L Draining Tank (Shipped with System)	2	-	-	-
Water Hand Pump (Shipped with System)	1	-	-	-
Draining Hoses (Shipped with System)	2	-	-	-
Water Shield Tape	As needed	-	-	-

Table 3. Consumables
Item	Quantity	Effectivity	Part number	Manufacturer
Towels	2 or 3	-	-	-

Table 4. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
FPU	1	-	Refer to FRU Manual	-

Table 5. Safety

Warning

ELECTROCUTION HAZARD!

Dangerous and or fatal voltages are present in the energized cabinet.

Follow LOTO steps as given in first section of this document to disable and verify safe voltage levels.

Procedure

Perform LOTO for ISC. Refer to Lockout / Tagout for ISC.
Open ICC Cover.

Note: If Service space is narrow, remove the door.

Figure 1. Remove Cover
Remove the bottom reinforcement bar by removing 6 screws.

Figure 2. Remove the bottom reinforcement bar
Turn F50 Power OFF.
1. Turn off the “Drive Switch”.
2. Turn off the “Main Power Switch”.
Figure 3. F50 Power OFF
Confirm that ISC and Cryocooler power are OFF.
Close the following valves.

Notice

Facility water valves position needs to be restored after replacement. Please check the position before closing. If Facility has water flow meter, record the flow value.

Close shut-off valves of FPU.

Figure 4. Close Valves
Drain the ICC primary water circuit to the tank per following steps.
1. Connect the draining hose to the emergency valve (a) and place the Service Tank to the other side. Then, open valve of (a).
2. If no more coolant leak from (a), connect the other hose to emergency valve (b) and connect hand pump to the other end. Then, open valve of (b).
  
  Note: Leave the valve (a) opened.
3. Push out the remaining coolant to Service Tank.
  
  Note: Leave the valve (a) and (b) opened.
4. Once draining is completed, close valves (a), (b), and (c). Then, remove hoses.
Figure 5. Draining
Close water valves for F-50.

Figure 6. Close F50 valves
Notice

Wear a pair of gloves to protect your hand.
Disconnect F-50 supply and return hoses from the elbow rotating adaptors.

Note: While rotating the hex head connector, the hose will also follow the rotation movement. Since the elbow of connector rotate freely, rotate the hose backward as needed.

Note: Remaining water in the hose will spill. Prepare towels before disconnecting.

Figure 7. Disconnect Hoses

Notice

If for facility coolant water includes chemical, follow the local regulation for disposal of coolant water.

Disconnect the FPU sensor cable connector from 3X11 of Control Unit.

Figure 8. Disconnect the FPU sensor cable

Disconnect GCU and CCU Quick Disconnects.

Figure 9. Quick Disconnects
Close the valves for F–50.

Figure 10. Close valves
Slide out the FPU to access to the FPU sensor per following steps.
1. Loosen a captive screw.
2. Slide the FPU out from ICC to access to the FPU Sensor.
Figure 11. Slide FPU
Remove the sensor according to the following steps.
1. Remove the pin which is fixing the sensor.
2. Pulling out the sensor to up direction.
Figure 12. FPU Sensor removal
Confirm the followings before installing new FPU sensor.
- Water shield o-ring must be at the connector top (border) shown below.
- Barcode label is the front side when installing.
  
  Figure 13. Confirmation for FPU Sensor
Install FPU sensor by reverse order of removal.
1. Install new sensor assy.
2. Insert Pin.
3. Restore FPU.
4. Fix FPU to chassis with captive screw.
For F-50 water hose connectors (supply and return), remove the remaining shield tape with tool such as precision driver for both connectors. Then, wind the shield tape by two turns.

Figure 14. Shield tape restoration
Restore the hose connectors and cables.
1. Restore Supply and Return Hose connectors for F-50.
2. Restore Quick disconnects for GCU and CCU.
3. Restore disconnect cable to 3 x 11 connector of Control Unit.
Open the valves in the following order.
1. Slightly open facility water valves.
  1. Open Return valve.
  2. Slightly open Supply valve.
2. Open shutoff valves for FPU.
3. Open valves for F50.
4. Check there is no water leakage at water connectors.
5. Open valves of supply and return of the facility water as it was. If facility flow meter exists, adjust the water flow as recorded.
Note: Specification of facility water flow is between 50L/min and 80L/min (13.2gpm~21.1gpm) Typical Value of water flow is 60L/min (15.8gpm).

Figure 15. Opening valves
Restore bottom reinforcement bar with 6 screws

Finalization

Turn on the F50 cryocooler.
1. Turn on the “Main Power Switch”.
2. Turn on the “Drive Switch”.
Turn on ISC Power. Refer to Removing LOTO - ISC.
Perform Water Flow Adjustment per following steps.
1. Insert SSA Service Key.
2. Open Common Service Desktop and select Diagnostics > System > Power/Support System > Cabinet Monitor Functional Diag.
3. Click Run and check Customer Coolant Flow Rate and check if displayed Customer Coolant Flow Rate is in between 50L/min and 80L/min.
  Note: Typical Value of water flow is 60L/min (15.8gpm)
  Figure 16. Cabinet Monitor Functional Diag
4. If the displayed value is between 50L/min and 80L/min, go to next step (3.e)
  If coolant flow rate is out of specification, adjust the FPU bypass valve until the coolant flow satisfies the specification.
  - To increase Facility Water Flow : Turn the Bypass valve to Clockwise. Maximum Water Flow when Bypass valve is at Vertical Position.
  - To reduce Facility Water Flow : Turn the Bypass valve to Counter Clockwise. Minimum Water Flow when Bypass valve is at Horizontal position.
  Note: Click Run Button of Functional Diag each time when measuring.
  Figure 17. FPU Bypass valve
5. Check the F-50 Water Flow by Magnet Monitor. (Press Data key, then press Down key to show Water_Flow)
  Figure 18. Magnet Monitor operation
6. Adjust the water flow by adjusting the F-50 supply water valve so that water flow becomes within 7~10 L/min. If it’s difficult to adjust the water flow within 7~10 L/min, adjust the water flow by referring to admissible range (water flow vs. water temperature) shown in Figure 20.
  Figure 19. F-50 Supply Valve Adjustment
  Figure 20. Cryocooler Water Cooling Requirements
Perform check scan.